Dark spots on the photosphere are known as
a. the corona.
b. solar wind.
c. sunspots.
d. the chromosphere. user: which type of electromagnetic radiation cannot be focused?
a. gamma rays
b. ultraviolet
c. infrared
d. x-rays

the darkspots on the photosphere are known as : C. sunspots this phenomenon happened because reduced surface temperature cause a concentration of magnetic fluc. The type of electromagnetic radiation that cannot be focused is : A. gamma rays gamam rays caused the electric fluctuation in the field to be much faster than the electron distribution, making it unable to be focused

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